Why can oxygen and carbon dioxide pass easily through the alveolar and capillary walls?

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asked Mar 18, 2024 68.7k views

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ISpark · Answer 1 · 2024-03-22T12:33:46+0000

The walls of the alveoli share a membrane with the capillaries. That's how close they are. This lets oxygen and carbon dioxide diffuse, or move freely, between the respiratory system and the bloodstream.

Why can oxygen and carbon dioxide pass easily through the alveolar and capillary walls?

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